diff --git a/src/matrix/m_replace.scad b/src/matrix/m_replace.scad
index fbc7dd32..fb838355 100644
--- a/src/matrix/m_replace.scad
+++ b/src/matrix/m_replace.scad
@@ -1,16 +1,14 @@
 function m_replace(m, x, y, value) =
     let(
 		rowY = m[y],
-        leng_rowY = len(rowY),
 		newRowY = [
-            for(i = [0:leng_rowY - 1]) 
+            for(i = [0:len(rowY) - 1]) 
             if(i == x) value
             else rowY[i]
-        ],
-        row_leng = len(m)
+        ]
 	)
     [
-        for(i = [0:row_leng - 1])
+        for(i = [0:len(m) - 1])
         if(i == y) newRowY
         else m[i]
     ];